Roaming Profile Quit From 1 PC Only

This is driving me mad! We use roaming profiles with XP Pro clients and 2003 domain controller. We have a second server that stores our roaming profiles. Suddenly I noticed that a particular icon on my start menu kept re-appearing. As I diagnosed the problem, I found that even though the computer was properly copying the profile from the server it will not copy it to the server. I checked permissions and ownership, emptied the server folder, and checked all group policies on both the domain and individually on the PC. Everything seems alright. All of our other PC’s and users (40 or so) seem to be alright at this point. I logged on to another pc and it copied the newly created profile it generated to the server perfectly. This is absolutely bezerk. Has anyone experienced this before?